Hmmm . . . not sure what you mean. Perhaps you're referring to fibroids or overgrowths of muscle? These can feel lumpy and are sometimes painful. They can make your bleeding irregular and/or heavy.
Your endometrium or uterine lining can also be thick(er) depending upon your time of month. At the time of your menses, you actually shed your endotrium so the bleeding that you see as your period actually represents or is your uterine lining. However, if you're post-menopausal, then a thick endotmetrium is actually worrisome for possible cancer.
Not sure how you came about getting a diagnosis of "thick uterus" but probably best to discuss your findings & concerns w/your family physician (not to mention whoever ordered the test).
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